Mammut MTR 201 Hydration Pack - 427cu in

Weighing in at an ultralight 7. 6 ounces, the Mammut MTR 201 Hydration Pack qualifies as the world’s lightest trail-running backpack. This hydration pack features breathable, fast-drying VenTech material to combat the nasty, sweat-logged back panel often found after a long-distance day on the…